/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package org.apache.jmeter.visualizers;

/**
 * The Interface to be implemented by any class that wants to be notified by
 * model which makes use of this callback-Interface.
 * 
 * @author <a href="mailto:wolfram.rittmeyer@web.de">Wolfram Rittmeyer</a>
 * @version $Revision: 493775 $ $Date: 2007-01-07 17:09:09 +0000 (Sun, 07 Jan 2007) $
 */
public interface ModelListener {

	/**
	 * Informs the Visualizer that the model has changed.
	 */
	public void updateVisualizer();

	/**
	 * Informs the Visualizer that a message should be displayed.
	 */
	public void displayMessage(String messageString, boolean isError);
}
